<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <script>
      function fn(gender) {
        if (gender === 1) {
          return "boy";
        } else if (gender === 0) {
          return "gril";
        } else {
          return prompt("gender?");
        }
      }
      console.log(fn(3));
    </script>
  </body>
</html>
